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copied!<p>Taking a look at the javadoc, you should be able to use the "take" method.</p> <blockquote> <p>public E take() throws InterruptedException Description copied from interface: BlockingQueue Retrieves and removes the head of this queue, waiting if necessary until an element becomes available.</p> </blockquote> <p>Just throw a for loop around the queue and voila! You can iterate with no problems. :)</p> <p><strong>Assuming the queue is strictly FIFO</strong></p> <p>You can then use "put" to put the item back into the queue if it is not the green shirt</p> <blockquote> <p>public void put(E e) Inserts the specified element into this priority queue. As the queue is unbounded, this method will never block.</p> </blockquote> <p>This way the non-green shirts will still be in the queue in order (once the loop is finished).</p> <p><strong>The way you have it setup</strong></p> <p>Since you are using a PriorityBlockingQueue, putting the objects right back in the queue could eventually lead to the same item being pulled off the queue each time around the loop. You would need to create a new queue to put the item back into once it is checked to see if it is a green shirt.</p> <p><strong>Example code</strong></p> <p>PriorityBlockingQueue queue = new PriorityBlockingQueue(); PriorityBlockingQueue backupqueue = new PriorityBlockingQueue();</p> <pre><code> queue.put("A"); queue.put("B"); queue.put("C"); queue.put("D"); List<String> saveList = new ArrayList<String>(); int initialSize = queue.size(); for(int i = 0; i < initialSize; i++){ String element = queue.take(); if(element.equals("C")){ saveList.add(element); } else { backupqueue.put(element); } } </code></pre>

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